U.S. Republican presidential hopeful Newt Gingrich attends the Celebration of American Values Leadership Forum during the National Rifle Association's (NRA) 141st Annual Meetings & Exhibits in St. Louis, Missouri in this April 13, 2012, file photo. A bankruptcy proceeding under way in Atlanta will determine whether the one company still owned by Callista Gingrich, Gingrich Productions, will lose an expected payout that now constitutes the bulk of the Gingriches' net worth, May 22, 2012. REUTERS/Tom Gannam/Files (UNITED STATES - Tags: POLITICS ELECTIONS)